Fluid Bearing Device

a technology of bearings and fluids, which is applied in the direction of sliding contact bearings, bearing unit rigid supports, instruments, etc., can solve the problems of deterioration in the releasability of molded products at the time, and achieve the effects of high impact resistance, superior durability and reliability, and sufficient level of adhesive strength

Inactive Publication Date: 2007-10-11
NTN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0018] Since it uses a resin housing, a motor having a dynamic pressure bearing device as described above, a stator coil, and a rotor magnet is inexpensive. Further, since a sufficient level of adhesive strength is ensured, the motor exhibits high impact resistance and is superior in ...

Problems solved by technology

On the other hand, when the adhesion portion is roughened to an excessive degree, a...

Method used

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Examples

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Embodiment Construction

[0027] In the following, embodiments of the present invention will be described with reference to FIGS. 1 through 7.

[0028]FIG. 1 conceptually shows an example of the construction of a spindle motor for an information apparatus with a dynamic pressure bearing device 1, supporting a shaft member 2 with a dynamic pressure oil film, incorporated therein. This spindle motor is used in a disc drive device, such as an HDD, and contains the dynamic pressure bearing device 1, a disc hub 3 mounted to a shaft member 2, and a stator coil 4 and a rotor magnet 5 that are opposed to each other through the intermediation, for example, of a radial gap. The stator coil 4 is mounted to the outer periphery of a bracket 6, and the rotor magnet 5 is mounted to the inner periphery of the disc hub 3. As described below, the dynamic pressure bearing 1 has a housing 7 fixed by adhesion to the inner periphery of the bracket 6. The disc hub 3 retains one or a plurality of discs D, such as magnetic discs (see ...

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Abstract

Disclosed is a fluid bearing device in which a high adhesive strength is ensured in fixing another member by adhesion to a resin housing. A bearing sleeve is secured in position inside the resin housing, and a shaft member is radially supported in a non-contact fashion by a dynamic pressure action of lubricant generated in a radial bearing clearance between the shaft member and the bearing sleeve. A metal bracket for mounting the stator coil of a motor is fixed by adhesion to the outer periphery of the housing, in which the adhesion portion of the outer periphery of the housing to be fixed to the bracket is roughened, setting the surface roughness to 0.5 μmRa to 2.0 μmRa.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a fluid bearing device. This fluid bearing device is suitable for use as a bearing device in the spindle motor of an information apparatus, for example, a magnetic disc apparatus, such as an HDD or an FDD, an optical disc apparatus, such as a CD-ROM, a CD-R / RW, or a DVD-ROM / RAM, or a magneto-optical disc apparatus, such as an MD or an MO, the polygon scanner motor of a laser beam printer (LBP), a color wheel for a projector, or the small motor of an electric apparatus, such as an axial flow fan. [0003] 2. Related Background Art [0004] Apart from high rotational accuracy, an improvement in speed, a reduction in cost, a reduction in noise, etc. are required of the motors as mentioned above. One of the factors determining such requisite performances is the bearing supporting the spindle of the motor. Recently, as such a kind of bearing, use of a dynamic pressure bearing superior in the ...

Claims

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Application Information

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IPC IPC(8): F16C17/00F16C17/10F16C33/10F16C35/02G11B19/20H02K5/16H02K5/167H02K7/08
CPCF16C17/107F16C33/107F16C33/1075F16C35/02Y10T29/49636H02K5/1675F16C2370/12Y10T29/49639Y10T29/49703G11B19/2018F16C17/00F16C33/10H02K5/16
Inventor ITO, KENJI
Owner NTN CORP
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